DEP(deps): Update cachetools requirement from ~=5.5.2 to ~=6.1.0

[dependabot]

Updates the requirements on cachetools to permit the latest version.

Changelog

Sourced from cachetools's changelog.

v6.1.0 (2025-06-16)

• Improve LFUCache insertion performance by switching to an implementation based on the cacheing <https://pypi.org/project/cacheing/>_ library.

• Update CI environment.

v6.0.0 (2025-05-23)

• Require Python 3.9 or later (breaking change).

• Remove MRUCache and the @func.mru_cache decorator (breaking change).

• Add an optional condition parameter to the @cached and @cachedmethod decorators, which, when used with a threading.Condition instance, should improve cache stampede <https://en.wikipedia.org/wiki/Cache_stampede>_ issues in massively parallel environments. Note that this will inflict some performance penalty, and therefore has to be enabled explicitly.

• Convert the cachetools.func decorators to use a threading.Condition instance to deal with cache stampede <https://en.wikipedia.org/wiki/Cache_stampede>_ issues. Note that this may result in a noticable performance degradation, depending on your actual use case.

• Deprecate support for cache(self) returning None to suppress caching with the @cachedmethod decorator.

• Improve documentation.

• Update CI environment.

v5.5.2 (2025-02-20)

• Reduce number of @cached lock/unlock operations.

• Improve documentation.

• Update CI environment.

v5.5.1 (2025-01-21)

... (truncated)

Commits

• bb6d71a Release v6.1.0.
• 77a9c59 Fix #260: Use LFUCache implementation based on Blake Reid's "cacheing" library.
• b1d4eb2 Bump codecov/codecov-action from 5.4.2 to 5.4.3
• 820b154 Refactor @​cachedmethod unit tests.
• e497575 Release v6.0.0.
• 0a8f391 Update related projects section.
• 3afef37 Pre-release v6.0.0b4.
• 34815dd Update documentation for v6.0.0.
• 8854b50 Add intersphinx extension.
• 0af4a07 Bump codecov/codecov-action from 5.4.0 to 5.4.2
• Additional commits viewable in compare view

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Summary by Sourcery

Enhancements:

• Bump cachetools dependency to ~=6.1.0 in requirements.txt and docs/requirements.txt

[sourcery-ai]

Reviewer's Guide

Relax the cachetools dependency to allow upgrading from 5.5.2 to 6.1.0 by updating the version specifier in both project and documentation requirements.

File-Level Changes

Change	Details	Files
Update cachetools version specifier to ~=6.1.0	Relax version constraint for cachetools in documentation dependencies Relax version constraint for cachetools in main project dependencies	docs/requirements.txt requirements.txt

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